ui/aura/client/visibility_client.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_AURA_CLIENT_VISIBILITY_CLIENT_H_
   6 #define UI_AURA_CLIENT_VISIBILITY_CLIENT_H_
   7
   8 #include "ui/aura/aura_export.h"
   9
  10 namespace aura {
  11 class Window;
  12 namespace client {
  13
  14 // An interface implemented by an object that manages the visibility of Windows'
  15 // layers as Window visibility changes.
  16 class AURA_EXPORT VisibilityClient {
  17  public:
  18   // Called when |window|'s visibility is changing to |visible|. The implementor
  19   // can decide whether or not to pass on the visibility to the underlying
  20   // layer.
  21   virtual void UpdateLayerVisibility(Window* window, bool visible) = 0;
  22
  23  protected:
  24   virtual ~VisibilityClient() {}
  25 };
  26
  27 // Sets the VisibilityClient on the Window.
  28 AURA_EXPORT void SetVisibilityClient(Window* window, VisibilityClient* client);
  29
  30 // Gets the VisibilityClient for the window. This will crawl up |window|'s
  31 // hierarchy until it finds one.
  32 AURA_EXPORT VisibilityClient* GetVisibilityClient(Window* window);
  33
  34 }  // namespace clients
  35 }  // namespace aura
  36
  37 #endif  // UI_AURA_CLIENT_VISIBILITY_CLIENT_H_